Muffler.



PATENTED AUG. 11, 190 "s. W smw.

MUFFLER.

APPLIGATIOIE FILED MAR. 7,1907.

arena? @FFHJE.

BENJAMIN W. SNOW, OF SYRACUSE, NEW YORK.

MUFFLER.

Specification of Letters Patent.

Patented 1mg. 11, mos.

Application filed lflarch '7, 1907. Serial No. 361,160.

To all, whom it may concern:

Be it known that I, BENJAMIN W. Snow, of Syracuse, in the county of Onondaga,in the State of New York, have invented new and useful Improvements in Mufflers, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to certain improvements in mufflers adapted to be connected to the exhaust of a gas or steam engine to reduce the noise incidental to such exhaust, and in some respects is somewhat similar to that set forth in my Patent 825,010 of July 8rd, 1906, in which a series of transverse perforated partitions or disks are fitted snugly within the cylindrical casing and spaced gradually increasing distances apart from the inlet toward the outlet to gradually retard the passage of" the exhausted gases through the cylinder from which they escape to atmosphere. My present invention makes use of some of those elements,- thereto a tube passing centrally through the cylinder, and disks in exact alinement with the inlet and outlet of the cylinder, and have provided a movable gate or closure adapted to be shifted to and from a position across the inlet end of the tube between the lirst batlie plate of the series and inlet of the cylinder, whereby a direct passage for the exhaust products may be established through the cylinder and disks, thereby relieving all back pressure upon the engine to utilize the full degree of power in climbing hills and other places where an excess of power is required.

My main object therefore, is to improve upon my former patent previously referred to the extent of establishinga direct passage for the exhaust gases through the cylinder and centers of the disks, and to provide means for opening and closing the direct passage to permit the use of the mufller and disks when an excess power is not required.

Other objects and uses will appear in'the following description.

In the drawingsl igurc 1 is a longitudinal sectional view of a muiiler embodying the various features ofniy invention. Figs. 2 and 3 are sectional views taken respectively on lines 2'2, and ir-S, Fig. l. r Fig. 4 is an enlarged detail sectional view through a portion of the cylinder and the disks ol the mufllcr showing a portion of one of the clamping rods and spacing sleeves for holding the disks apart.

length of the cylinder,

except that l have added- This muflier comprises essentially a cylin drical sheet metal casing -1 having end heads -2- and 3 of similar material, within which is closely fitted a series of circui,

lar diaphragms or partitions -4 the latter being spaced apart gradually increasing distances from the inlet, -53, toward the outlet -6 and are held in fixed relation. by spacing sleeves 2 and clamping rods S passing through the spacing sleeves" and apertures in the disks alined therewith.

The end heads -2 and are fitted over and upon the opposite ends of the cylinder l and are clamped thereto by the bolts 8- which-are co-extensive with the the heads being spaced apart from the first and last dia phragm or disk -4- of the series by spacing sleeves 7.

The first disk '-4 ol the series is preferably ,tlat and disposed a distance inwardly "rom the inlet head -2-' somewhat greater than the widest space between the last disk and the one adjacent thereto while the last disk oi the series is spaced apart from the end head 3- a greater distance than the intervening space between the list disk and inlet head, the object of which is to provide ample room for the expansion of the gases after passing through the )erl'orations of the several disks, from which latter chamber the gases are exhausted nearly pressure.

Each'disk --4 is provided with a series of apertures -9- usually arranged in concentric rows at one side of the center, those in one disk being arranged out of alinement with those of the next adjacent disk to cause the products of comlnistion to travel in tortuous paths through the several disks bei'ore finally discharging from the cylinder -1--, and owing to the act that the disks are spaced gradually increasing distances apart from the inlet end toward the outlet end the gradual increasing spaces permits a gradual increase in the expansion of the gases before at atmospheric reaching the enlarged expansion chamber at the discharge end of the cylinder. In other words, this arrangement oi the lates or disks permits the gases to gradually expand so that by the time they rcach the last chamber of the cylinder the expansive force is reduced practically to atmosphere. I find, however, that it is desirable to provide means for open ing direct ronuuunicalion between the inlet -5 and outlet 'U-, particularly when the extending arm having an offset -16- full power of the engine is required in the propulsion of the vehicle, and for this purpose I have rovidcd a center tube 10 running central y through the baffle plates or diaphragms 4, and therefore, centrally through the intermediate portion of the cylinder, said tube being of substantially the same diameter as and alined with the central openings -5 and (3 in the opposite end heads 2 and 3-- and extends from the first plate -4- to a point slightly beyond the last plate -4 of the series, thereby permitting the discharge of the exhaust products in a direct line l roni the inlet to the outlet through the cylinder and centrally throu h the baffle plates.

One end of the tube with an out-turned annular llange abutting against the inner face of the first plate 4 ol' the series, and between this flange and the second plate ol the series is interposed a sleeve --1lby which the tube 10- is clamped. inplace against endwisemovement when the tie rods -8- are drawn up.

A gate or closure 12-- is pivoted at 13 to the inlet side of the lirst plate l-- of the series and is movable across the inlet end of the tube 1() between the first plate and an additional cut oil plate or segment l 4 which is also seemed by rivets 15 to the first plate. The object of this segmental plate or cutoll 1l-- is to protect the adjacent surl ace ol' the lirst balile plate of the series against accumulation oi carbon or other products of exhaust thereon so as not to interl'ere with the tree sliding movement of the gate or closure 12*, and at the same time to afford a suitable guide into which the gate is moved to its closed position. This gate may be operated by any suitable mechanism and for this purpose it is provided with a radial provided with a slot 17 which receives one end of a crank-arm -18 on a rock-shai t 1 9, said rock-shalt being journaled in asutiable bushing 2() in the inlet head -2 at one side of the inlet 5, and is provided at its outer end with a second crank-arm 21 ads ted to be connected to any 0 erating mec anism not necessary to herein i lustrate or describe, or the crank-arm 21- may serve as a means lor operating the closure 12-.

in operation, under ordinary conditions when but little power is required, the gate 12 is closed allowing the products of combustion to pass through the a )ertures in the several battle plates before finally discharging through the outlet -6- to atmosphere, but when the full power of the engine is required the valve 12* is open allowing the exhaust products to pass in a direct line from the inlet -5- through the tube -10 and 6 to atmosphere through the outlet 10* is provided -6-. The invention, however, lies par-- tieularly in passing the tube centrally eeaeev through a series of bafiie plates fitted Within a cylindrical casing having end heads rovided with central inlet and outlet openings in direct alinement with o posite ends of the tube, in combination with a closure or gate movable across the inlet end of the tube.

What I claim is:

1. A muffler for gas engines comprising a cylindrical casing having removable end heads, each provided with a substantially central opening of less diameter than the interior diameter of the casing, a series of circular disks spaced gradually increasing distanccs apart from the inlet toward the outlet and of substantially the same diameter as the interior diameter of the casing, said disks having central openings in direct alinement with the central openings in the end heads and a gate movable across the central opening of the disk nearest to the inlet.

2. A mu'liler for gas engines comprising a cylindrical easing having removable end heads each provided with a substantially central opening, one being the inlet and the other the outlet and the outlet being of less diameter than the interior diameter of the casing, a series of circular disks spaced gradually increasing distances apart from the inlet toward the outlet and of substantially the same diameter as the interior diameter of the case, said disks having central openings in direct alinement with the central openings in the heads, a gate movable across the central opening of the "first disk of the series nearest the inlet, clamping bolts assed through said disks and end heads, an spacing sleeves between the disks and heads holding said disks a fixed distance apart from each other and from the heads.

3. In. a mulller for gas engines, a cylindrical casing having an inlet in one end and an outlet in the opposite end, separate transverse disks fitting snugly within the casing and arranged at progressively increasing distances apart from the inlet toward the outlet, said disks having central openings in direct alinement with the inlet and outlet of the cylinder, each disk having an o 7 ening therethrough at one side of its contra opening, and a gate movable across the central opening of the first disk nearest the inlet.

4. In a muffler for gas engines, a cylindrical casing having an inlet in one end and an outlet in the opposite end, separate transverse disks fitting snugly within the casing and arranged at progressively increasing distances apart from the inlet toward the outlet, said disks having central alined openings in direct alinement with the inlet and outlet, and also provided with additional openings at one side of the central opening, a tube assing through the central opening of the disks and a gate movable across the inlet of the tube.

In a muffler for the purpose described, a

cylindrical casing and a series of transverse disks or partitions fitting within the casing and spaced gradually increasing distances apart from the inlet toward the outlet, the s ace between the last disk of the series and t e outlet being greater than that of the other spaces between the disks, said disks being provided with central openings in direct alinement with the inlet and outlet, and a gate movable across the central opening of the first disk of the series nearest the in et.

6. In a muffler for the purpose described, a cylindrical casing and a series of transverse disks of substantially the same diameter as the interior diameter of the casing, and arranged at progressively increasing distances a art from the inlet toward the outlet, each dis having a central opening in direct alinement with the inlet and outlet, a tube passed through the central openings in the disks, a gate movable across the inlet end of the tube, said disks being provided with additional openings at one side of the central opening.

7. A mufller for the purpose described comprising a single tubular casing and a series of transverse partitions, each separate therefrom, but of substantially the same cross sectional area as the cross sectional area of the interior of the casing and having a circulaI' row of apertures at one side of its center, said disks being provided with central openings in direct alinement with the inlet and outlet and a gate movable across the cen tral opening of the first partition. of the series nearest the inlet.

- inlet and outlet,

8. In a muffler of the character described, a cylindrical casing and a series of circular disks fitted therein and spaced gradually increasing distances apart, said disks having alined central openings, a tube passed through said openings, and a gate movable across one end of the tube, the disks being provided with additional openings at one side of their central openin s.

9. In a mu er of the character described, a cylindrical casing provided with end heads, one head having a central inlet and the other head having a central outlet, a tube within the cylinder between said heads, but spaced apart therefrom and having a central opening therethrough in direct alinement with the a gate movable across the inlet end of the tube and a series of disks encircling the tube and provided with openings therethrough at one side of the tube.

10. A mufiier of the character described comprising a cylindrical casing and end heads therefor, one head having a central inlet and the other having a central outlet, a series of perforated disks fitted within the cylinder and provided with central openings in direct alinement With the inlet and outlet, a gate.

movable across the central opening of the -first disk nearest the inlet, and means for opening and closing said gate.

In witness whereof I have hereunto set my hand this 4th day of March 1907.

BENJAMIN W. SNOW.

Witnesses:

H. E. CHASE, C. M. MOCORMAO'K; 

